Best practices for ultra-high resolution magnetic and radiometric statewide merges

Statewide geophysical grid merges are typically created using regional government-funded surveys. The merge products generally have grid cell sizes between 40-50 m due to typical regional survey line-spacing occurring in the 200-250 m range. On a statewide scale, these products provide an excellent overview of regional geological features. However, any geophysical surveys flown at less than 200 m line-spacing lose their finer details in the process. Geophysical grid merging is a complicated technique which can be enhanced by following a series of best practices in the preparatory stages. Since 2020, the Geological Survey of NSW (GSNSW) has updated its statewide geophysical merges iteratively, and as a result has generated a fully documented procedure to allow seamless iterations upon existing products. Latest statewide geophysical merges in NSW are performed at a cell size of 25 m, a fourfold increase in data resolution to previous merges. Additionally, these same merging practices allow the creation of a 10 m cell size regional merge over central NSW - highlighting the wealth of high-resolution company data over areas of high prospectivity.